Modern turbodiesel problems
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[TW]Fox;11909800 said:
I'm sure the DPF needs to be replaced every 100,000 miles or so too - sure I read a post on BMWland where a guy had to have the DPF replaced on his 535d and it cost a grand
Found it.. apparently they want £1439!
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Engines that have EGR tend to create more soot and hence need the DPF even more. Peugeot first used them back in 2002, developed by Faurecia a company I did my placement year for.
Different OEMs use various methods for DPF regeneration. BMW tend to use Oxicats that include the DPF. These are close to the engine and hence reach the 330C needed to burnt off accumulated soot quite easily. They are passively regenerated and should reach temperature in normal driving, sometimes they dont and will need a hard drive to clear a warning light (pressure sensor detects excessive backpressure and sends this info to the ECU)
Other OEMs have seperate DPFs that need help in reaching temperature. VWs have a post combustion injection of fuel, controlled by the ECU, that burns in the exhuast increasing DPF temperature. This has issues though as it tends to increase fuel dilution in the engine oil.
The joys of reduced emissions hey.
Different OEMs use various methods for DPF regeneration. BMW tend to use Oxicats that include the DPF. These are close to the engine and hence reach the 330C needed to burnt off accumulated soot quite easily. They are passively regenerated and should reach temperature in normal driving, sometimes they dont and will need a hard drive to clear a warning light (pressure sensor detects excessive backpressure and sends this info to the ECU)
Other OEMs have seperate DPFs that need help in reaching temperature. VWs have a post combustion injection of fuel, controlled by the ECU, that burns in the exhuast increasing DPF temperature. This has issues though as it tends to increase fuel dilution in the engine oil.
The joys of reduced emissions hey.
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[TW]Fox;11909457 said:
Late model Peugeot 406's and all Peugeot 407's have the same issue. Quite happy mines an older 406
Fog
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Can the particle filter be removed? If you run into problems monthly it makes more sense to get rid of the problem (although this may include getting a appropriate car for your driving needs.)
Don't think it will be quite that straight forward, certainly from what I've seen on the Peugeots. Ties in with various systems, including the main ecu
Fog
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DPF's have been around in various guises for a while now - I had one on my 2003 C5 2.2HDi which, I think, was the first mainstream engine to be fitted with one. As part of the schedule the DPF needed cleaning by the dealer every 50k, but it soon became apparent that there were environmental issues with this. Exchange filters were then brought in but these cost a few hundred quid to replace. I never got that far with mine but it upset a few owners.
As the technology progressed, 'lifetime' filters soon became available.
There are 2 approaches to regenerating the DPF. PSA use a fuel additive called Eolys fluid which is added to the fuel by an electronic valve when you fill up. This lowers the temperature at which the soot will burn and presumably makes the regeneration process quicker. I never had any problems with my C5 which used this system and I didn't avoid short trips. The only issue with Eolys fluid is it is very expensive - something like £30 a litre IIRC because it contains various precious metals.
Other manufacturers make do without an additive and rely on ECU to run a regeneration cycle to artificially heat the filter to burn off the soot as outlined above. It's these cars that seem to have the problems.
Manufacturers starting fitting them en-masse to meet EuroIV emissions standards, but some EuroIV cars manage without one - they were never fitted to Mk3 Mondeo's for example. They were optional on some cars too - I'm not sure why anybody would want to pay extra for one!
In this country if you only drive at peak times there are few places where you can drive at a continuous speed for 15 minutes these days!
As the technology progressed, 'lifetime' filters soon became available.
There are 2 approaches to regenerating the DPF. PSA use a fuel additive called Eolys fluid which is added to the fuel by an electronic valve when you fill up. This lowers the temperature at which the soot will burn and presumably makes the regeneration process quicker. I never had any problems with my C5 which used this system and I didn't avoid short trips. The only issue with Eolys fluid is it is very expensive - something like £30 a litre IIRC because it contains various precious metals.
Other manufacturers make do without an additive and rely on ECU to run a regeneration cycle to artificially heat the filter to burn off the soot as outlined above. It's these cars that seem to have the problems.
Manufacturers starting fitting them en-masse to meet EuroIV emissions standards, but some EuroIV cars manage without one - they were never fitted to Mk3 Mondeo's for example. They were optional on some cars too - I'm not sure why anybody would want to pay extra for one!
In this country if you only drive at peak times there are few places where you can drive at a continuous speed for 15 minutes these days!
Interesting. How many miles is expected before you need to top up this fluid then?
No, diesel cats are completely different to a DPF.
Good grief, the hoops they jump through to meet emissions is mad.
On the older mechanical diesels (like the XUD) the first thing you do is unplug the EGR as you don't want the crud being sent back through the engine!
Another reason for me to dislike new common rail stuff.
On the older mechanical diesels (like the XUD) the first thing you do is unplug the EGR as you don't want the crud being sent back through the engine!
Another reason for me to dislike new common rail stuff.
S0ck olly is correct,
My HDi HAD a particle filter which many mistake as a cat.. honeycomb thing to trap all the soot.. I cut mine out.
The modern engines have the special filter thing to pass emissions that requires some liquid stuff to keep it working
My HDi HAD a particle filter which many mistake as a cat.. honeycomb thing to trap all the soot.. I cut mine out.
The modern engines have the special filter thing to pass emissions that requires some liquid stuff to keep it working
So you'd need to swap it back on each year to pass the MOT?